mytable = setmetatable({ key1 = "value1", key2 = "1" }, {
    __index = function(mytable, key)
        if key == "key2" then
            return "metatablevalue"
        else
            return nil
        end
    end
})

print(mytable.key1, mytable.key2)

print(mytable.key3)

Account = {balance = 222}
Account.__index = Account

print(Account.key)